Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f844a4ea3fcc84e…

MALICIOUS

PDF

88.0 KB Created: 2021-06-29 17:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f92e83157f8e7da3f46094fd2da0fb43 SHA-1: 7b58d39c869063f2896ee59fc731762939cb4686 SHA-256: 0f844a4ea3fcc84e5b7708e2778be4cfc8a2773a00c39f0dec5c5f4038f1d4ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains an exploit. The document contains numerous links, many pointing to other PDFs hosted on compromised websites, suggesting a link farm designed to distribute malware. The presence of a 'download' button lure further supports a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://accessiblevehicleservices.com/userfiles/file/lewizadevesulokegotebuxu.pdf In PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/78021248988.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea683829a---84269290505.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/4oavgk66nda8r8r795dsueuov5/dopejipamabuxugosedexivop.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/58881781100.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729bf2a8047---ripizujaxitumijorutazogig.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8a301679187e90846001212ad6c8cb58/vovakelopoperavob.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/43164523862.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/7a2b0149e62ef9cbdf8c3374828b973e/60760238822.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083eabd8c897---dojawewot.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/218dddba8ee447078f5e41e53c5f4900/fozexejupuzabopaselo.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/2f9be36599b415739628742e4342ed4d/subupewovifuvejisilim.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609effdb8f27c---24229454611.pdfIn PDF document text
    • https://avela.md/userfiles/file/75563473019.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079655df073c---88555659407.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/nagivivu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rp9av37bb0kr6877lhk7od370c/20432426058.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/jekavixoxanaxeku.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b485b14066---zenibizonisabujenisenatim.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d2fba3e7---94040154056.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160758214d9bbf---kefazujigevotogetake.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/cf062598d87cafed779d6654b8851cb8/zejabinazewile.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/22690866490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=911+s5+for+macPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 18992 bytes
SHA-256: 8f45dece59a27e12a81d11ea7bcd5f0db4b50cf5b8d12c28db2f60c0cccb5b5d
font_01_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1B 10284 bytes
SHA-256: 1d1ebbc77d0a43bb77173de49b3e5255ddc249b2f3c2e840892f450db0954996